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Flat iron for cable trays

Fiber optic splice closure knowledge brief Published 01 Jul 2025

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Mild steel flat iron, typically 16–18 gauge, is commonly used for the side rails and rungs of cable trays.Material and Specifications

Cable trays are generally constructed from mild steel, galvanized steel, or aluminum, depending on environmental conditions and load requirements . For ladder-type trays, which are widely used, the side rails and rungs are often made from flat iron or tubular steel. The flat iron provides the necessary mechanical strength to support cable bundles while maintaining a rigid structure . Typical thickness for flat iron in cable trays ranges from 16 to 18 gauge, balancing strength and ease of installation .

Structural Use
  • Side Rails: Flat iron forms the longitudinal rails of ladder trays, providing the main structural support for the tray system .
  • Rungs/Cross Members: Flat iron or tubular steel rungs are welded or bolted between the side rails at intervals of 6 to 12 inches, depending on cable weight and spacing requirements .
  • Load Capacity: The gauge and width of the flat iron determine the tray's load class, which defines the maximum cable weight the tray can safely support over a given span .
Standards and Installation

Cable trays, including those using flat iron, are manufactured according to IEC 61537 or BS EN 61537 standards, ensuring proper mechanical strength, corrosion resistance, and compatibility with fittings . Flat iron components are often galvanized or powder-coated to resist corrosion, especially in industrial or outdoor environments . Installation requires proper support spacing, secure fastening, and alignment to maintain structural integrity and cable safety .

Summary

For most industrial and commercial applications, mild steel flat iron (16–18 gauge) is the standard choice for cable tray side rails and rungs, providing a durable, cost-effective, and code-compliant solution for supporting electrical cables .

Flat iron for cable trays - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

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Technical note

This reference is intended for preliminary fiber optic splice closure research. Compatibility, splice capacity, sealing class, tray layout, protection sleeves, installation methods, test limits and applicable standards must be verified for the specific project.

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